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56131-F 31
TROUbLESHOOTING
Note: The two most common causes of malfunctioning gas appliances are loose wiring connections
and construction debris clogging pilot and/or control valve lter.
Note: Before troubleshooting the system make sure gas shut off valve is open.
MILLIVOLT SYSTEM
REMEDY
1. Check to see if you have gas
supply
2. Hold control valve in the
PILOT position for 2 to 3
minutes to purge air. If you
smell gas stop and wait for a
few minutes before trying to
light the replace
3. Remove debris and dirt, in-
spect and clean any other
possible obstructions
4. Contact your gas supplier
5. Refer to section on pilot
lighting
6. Have a qualified technician
replace pilot line
7. Replace control valve (see
Replacement Parts and Ac-
cesssories, page 34)
8. Tighten thermocouple or re-
place
1. Check wiring connection. Refer
to Wiring Diagrams, page 33
1. Check electrical connections
2. Re-check problem "Pilot Will
Not Stay Lit"
1. Clean and adjust pilot ame for
maximum ame impingement
on thermopile
1. Replace thermopile
1. No gas supply, or shutoff valve
is OFF
2. Air in gas line
3. Construction debris clogging
pilot orice
4. Low gas pressure
5. Control valve knob is not on
the PILOT position
6. Kinked pilot line
7. Bad valve
8. Bad thermocouple or loose
connection
1. Loose wiring on thermopile to
regulator valve. No millivolt
current being sent to regulator
1. Wall switch wires defective
2.
Thermopile generator or sensor
not generating sufcient voltage
1. Pilot ame may be too low,
causing safety pilot to “drop
out”
1. Millivolt output on thermopile
too high
Pilot will not light
Pilot will not stay lit
No gas to burner, although wall
switch and valve are set to the
ON position
Frequent pilot outage
Pilot goes out when wall switch
is on
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If they
can’t supply original replacement part(s) call DESA
at 1-866-672-6040 for referral information.
TECHNICAL SERVICE
Continued
When calling DESA, have ready
• model number of your replace
• the replacement part number